Chuck for machine tools



Aug. 11, 1931. E, SEARS ETAL 1,818,167

CHUCK FOR MACHINE TooLs Filed Jan. 20, 1930 2 Sheets-Sheet l PatentedAug. 11, 1931 STATES EDWARD SEARS AND CARL F. WAGNER, OF DEER LODGE,MONTANA CHUCK FOR MACHNE TOOLS Application led January 20, 1930.

Our invention relates to automatic chucks more particularly intended foruse on boring mills adapted for cutting tires andv wheels and boringwheel centers of cars and locomotives, or. the machining of otherannular work.

The invention has for its object the provision of means whereby varyingsized tires and wheels may be operated onk and whereby the tire or wheelclamping means will auto- 32a to be made and hence a greater number oftires or wheels to be operated on in a given period of time than hasheretofore been possible.

The objects and advantages of our inven- "-a' tion will all be readilycomprehended from the following detailed description of the accompanyingdrawings, wherein:

Figure 1 is a plan View of our improved chuck with a wheel or tire inclamped posi- 2gb tion thereon.

Figure 2 is a side elevation thereof, with a portion of the table brokenaway, and a tire or wheel shown in position.

Figure 3 is a sectional view taken sub'- stantially along the line 3 3of Figure 1.

Figure t is a sectional detail view taken on the line t-e of Figure 3 asviewed by the arrows.

Our invention relates to a chuck for use in connection with a boringmill whereby a car or locomotive tire or wheel may be quickly clamped inposition on a suitable table indicated at 10.

This table is preferably circular' in form and provided with radiallydisposed slots or grooves shown at 11, ruiming inwardly from the outerperimeter of the table 10 and terminating in the central openingor hole12.

Mounted on the table 10 is a hub member Serial No. 421,917.

13 provided with a depending portion 111 adapted to fit snugly in theopening 12 of the table 10, as shown in Figure 3. The inc-"iber 13 isheld in place by the bolts 15 whose heads are arranged in the slots 11.The hub member 13 on its perimeter is provided with an annular shoulder132L and therebeneath with an annular radial iiange 16. Disposed abouthub member 13 and resting on the shoulder 13a is an annular member orring 17,' arranged to permit rotation about member 13. lith the annularmember 17 seated on the shoulder 13a maintains the member 17 in spacedrelation with the tlange 1G and thus provides an annular groove, asshown, for the purpose of receiving the inner ends ot thechuck-controlling arms or bars 18.

hese arms or bars 18 are pivotally held to member 17 by suitable boltsor pins 19.

The outer ends of the bars or arms 18 are connected to the base portions20 of the chuck elements which have their inner ends slotted to receivethe adjacent ends ot' the arms or bars 1S; said ends being pivotallyheld in place by suitable bolts or pins 21 which extend downwardlythrough the inner slotted ends of the base portions 2O ot' the chuckelements, as shown in Figure 3. The base portions 2O are provided withupstanding lugs or portions 22 arranged at an intermediate pointrelative to the other side edges of the base member so as to leave ashoulder 23 on which the wheel or tire A rests.

Pivotally secured to each upstanding lug 22, so as to swing vertically,is a chuck head or jaw 24 whose lower end is preferably bifurcated tostraddle the stud or lug 22.

The bifurcations and the lug havey registering apertures to receive asuitable pivot pin 25 so as to pivotally connect the chuck elements 24in place and permit them to swing vertically toward and away from thetire A; it being understood that the chuck heads or jaws 24 have theirupper ends disposed horizontally in hook form so as to extend over thetop of the tire, as shown in Figures 2 and 3.

The chuck heads or jaws 24 each have a slot 2G extending verticallytherethrough tor the purpose of receiving the eccentrically mountedclamp elements 2T which are eccentrically pivoted to the jaws 211 bymeans of suitable tap bolts or pins 28 whereby rotative movement et theclamp elements is permitted. rPhe clamp elements 2T have the elongatedlingereiigzigiiig` ends, while the lower pivoted end is preferablyprovided with a serrated surface, as at 29, adapted to provide `greatergripping relation with the top surtace ot the tire A. lt is apparentfrom the construction shown in Figure 4l, where the clamp element QT isshown in clamping` position, that by swinging the tree end ot the clampmember toward the rigrht in Figure et will release the clamp and moveits eccentric serrated head out of engagement with the tire or wheel.

then it is desired to pertorm a cutting;l operation on the metal tire A,the latter is placed on the shoulders 3 ot each ot the base portions 2()ot the chuck elen'ients; it being understood that the jaws 24toit eachot the chuck elements have previously been swung outwardly about thepivot points or pins Q5 and therefore away Yl'rom the tire.

The chuck elements are drawn into lirm or intimate relation with thetread ot the tire by inij'iartiire` slight rotative movement to theannular element 17, thereby drawing` inwardly on the various arms 18which latter are, of course, of equal length. Such rotative movement otthe element 17 will draw the arms 18 into the position shown in Fig;-ure-1, which causes the chuck elen'ients to be drawn inwardly on thetable. The positions oi' the chuck elements. relative to the table, aremaintained by bolts 30 whose heads ride in the slots or grooves 11 otthe table and thus maintain the chuclr elements in regular alignmentwith the axis ot the hub member 13. Atter the chuck elements have beenthus brought into intimate relation with the tread ot the wheel or tire,the chuck elements are then lirmly held in position by screwing up thenuts 31 ou the bolts 30, thus maintainingl the adjusted position of theelements. Atter this has been done, the aw members 2d: are then swung`upwardlv over the wheel or tire in the positions shown in the figures,at which time a suitable wede'e member 32 is then preferably driventransversely beneath the shoulder 'termed adjacent to the pivotal end ofeach jaw.

This firmly maintains the jaws ot the clutch elements in clampingposition. The eccentrically mounted dogs or clamp elements 27 are thenrotated about their pivot pins 28 in the manner shown in Figure il: soas to bring the eccentric portion ot the serrated head Q0 into firmgrippiim` relation with the top surface ot the wheel or tire A.

Vith the dogs or clamp elements 27 in this position, the latter willautomatically increase their gripping` relation with the tire as thecutting operation on the tire is started.

ln order to permit the necessary rotative movement ot' annular member 1Tto be performed, the latter, on its outer perimeter at a number otspaced apart places, is prefer ably provided with the radially disposedsockets or holes 811-, tor the purpose ot receiving' a suitable tool orimplement to provide leverage tor rotatingthe element 17, to an extentsutlicient to cause arms 18 to draw the chuck elements with theirupstanding lugs 22 into firm relation with the perimeter ot the wheel ortire to be operated on.

The drawings disclose what we believe to be a simple embodiment ot theinvention which has been described in terms employed merely as tern'lsot description and not as terms ot limitation, as structuralmodifications are possible and may be made without, however, depart-ing`from the spirit of our invention.

lVhat we claim is:

1. A device tor holding` a locomotive or car wheel tire comprising anannular table provided with a central opening and with radially disposedslots intermediate ot said opening` and the perimeter of the table; amember provided with. a depending huh which is adapted to extend intothe central opening' ot the table; means for holding said member againstrotation; a. second member rotatably disposed about the {irst member;chuck elements disposed at diametrically opposite points on said tableand provided with tire receivingsurtaces; hooleshaped jaw memberspivotally secured at their lower ends on the chuck elements so as toswine` vertically with the tree ends provided with vertical openings;verticallj7 disposed tire clamp elements eceentrically mounted on saidopeniu js in the jaw members so as to have increasing' clamping actionon the tires as the clamp elements are caused to move rotatably;radially disposed connecting bars pivotally secured at their respectiveends to said second mentioned member and said chuck elements; and meansdisposed through the chuck elements and engaging in the radial slots ofthe table whereby the chuck elements may loe locked in adjustedposition.

Q. A device of the character described comprising an annular tableprovided with a central hole and with radially disposed slots: a hubmember provided with a. central hub seated in said hole; a ring`rotatably disposed about the hub member; chuck elements diametricallydisposed on said table in alignment with the slots and each having atire receiving upper surface and an upstanding lug adjacent to saidsurface; hookshape jaw members each having a bifurcated lower endadapted to straddle said upstanding lug and to be pivotally securedthereto so as to swing vertically across the top of the Wheel tire, thefree ends of the jaw elements being transversely slotted; verticallydisposed clamping elements eccentrically mounted in said jaw elementslots and adapted to provide increasing clamping action on the uppersurface of' the tire; connecting bars pivotally connected at theirrespective ends to said ring and to each of said chuck elements; meansengaging in the table slots7 whereby the chuck elements are clamped intheir adjusted positions; and Wedge elements insertible on the chuckelements beneath the pivoted ends of the jaw members.

EDNARD SEARS. CARL F. WAGNER.

